EP 2933386 A1 20151021 - CONSTRUCTION MACHINE
Title (en)
CONSTRUCTION MACHINE
Title (de)
BAUMASCHINE
Title (fr)
ENGIN DE CHANTIER
Publication
Application
Priority
- JP 2012272215 A 20121213
- JP 2013006798 W 20131119
Abstract (en)
Provided is a construction machine capable of both of cavitation prevention and reduction in a power loss. The construction machine includes: a lower traveling body; an upper slewing body; a front attachment; a plurality of hydraulic actuators including traveling motors (13 and 14); hydraulic pumps (10 and 11); a plurality of control valves (16 to 21) for the hydraulic actuators; a plurality of operation units (22 to 27) for the control valves (16 to 21); traveling operation detectors (38 and 39) that detect operations for the operation units (25 and 26) for the traveling motors of the operation units; a back-pressure compensation valve (29) generating back pressure in a return pipe line (28) connecting each of the control valves and a tank and having a setting pressure switchable between low and high pressure setting values; and a back-pressure control section (31 and 32) performing a back-pressure lowering control of making the setting pressure of the back-pressure compensation valve (29) be the low pressure setting value when traveling operation amounts in the traveling operation units are large.
IPC 8 full level
E02F 9/22 (2006.01); F15B 11/02 (2006.01); F15B 11/028 (2006.01)
CPC (source: EP US)
E02F 3/30 (2013.01 - US); E02F 3/32 (2013.01 - EP US); E02F 9/2228 (2013.01 - EP US); E02F 9/226 (2013.01 - EP US); E02F 9/2282 (2013.01 - EP US); E02F 9/2285 (2013.01 - EP US); E02F 9/2292 (2013.01 - EP US); E02F 9/2296 (2013.01 - EP US); F15B 11/028 (2013.01 - US); F15B 11/16 (2013.01 - EP US); F15B 11/044 (2013.01 - US); F15B 2211/20576 (2013.01 - EP US); F15B 2211/45 (2013.01 - EP US); F15B 2211/50545 (2013.01 - EP US); F15B 2211/5156 (2013.01 - EP US); F15B 2211/526 (2013.01 - EP US); F15B 2211/555 (2013.01 - US); F15B 2211/6346 (2013.01 - EP US); F15B 2211/665 (2013.01 - EP US); F15B 2211/6653 (2013.01 - EP US); F15B 2211/7058 (2013.01 - EP US); F15B 2211/7135 (2013.01 - EP US); F15B 2211/8609 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2933386 A1 20151021; EP 2933386 A4 20160210; EP 2933386 B1 20171018; CN 104812967 A 20150729; CN 104812967 B 20180529; JP 2014118686 A 20140630; JP 6089665 B2 20170308; US 10041228 B2 20180807; US 2015299987 A1 20151022; WO 2014091684 A1 20140619
DOCDB simple family (application)
EP 13861615 A 20131119; CN 201380061560 A 20131119; JP 2012272215 A 20121213; JP 2013006798 W 20131119; US 201314442814 A 20131119